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Maytag Stack Info / Diagnostics

 

TROUBLESHOOTING

CAUTION

Always disconnect power supply before making any continuity checks or resistance readings.

THE MICROPROCESSOR MODELS FOR ELECTRICAL FAILURES

SYMPTOM

CAUSES

TEST PROCEDURE 

SOLUTION

Control will not function

No power to trans-

Check transformer input

Reset breaker, replace

and no pad will

former.

for 120 VAC.

fuse, plug in machine.

respond.

 

 

 

 

 

 

Replace transformer.

 

Transformer

Check transformer for

 

 

 

10 and 26 VAC outputs.

 

 

 

Check for 10 and 26

Replace wiring.

 

Wire Harness

VAC at the control

 

 

 

board.

 

 

 

Plug electric ribbon of a

Replace membrane

Touch Pad

new touch pad

switch.

 

 

assembly into ribbon

 

 

 

connector.

 

 

 

If all above checks

Replace control board.

Control Board

pass

 

Control will not stay on

Control Board

Replace control board.

Replace control board.

unless a program pad is

 

 

 

held down.

 

 

 

An LED or display

Control Board

Initiate the visual diag-

Replace control board.

segment won't light.

 

nostics. If any L.E.D. or

 

 

 

segment won't light

 

CAUTION

Always disconnect power supply before making any continuity checks or resistance readings.

SYMPTOM

CAUSES

TEST PROCEDURE

SOLUTION

Relay, water valve, or

Transformer

Check transformer for

Replace transformer.

lid switch will not func-

 

26 VAC output.

 

ti on.

 

 

 

 

Wire Harness

Check for 26 VAC on the

Replace wiring.

 

 

control board.

 

 

Control Board

Check self-diagnostic

Replace control board

 

 

operation.

 

 

 

Check for 24 VDC at the

Replace wiring.

 

Wire Harness

board and the relays.

 

 

 

Turn on each machine

 

 

 

(dryer and washer) and

Replace relays.

 

All relays have failed

check each relay for

 

 

open.

contact closure. Check

 

 

 

relay coils for conti-

 

 

 

nuity.

 

Motor runs continuously

Run Relay Engaged

Check for constant 24V

Replace relay or control

 

 

to relay coil (control

board

 

 

board problem) check

 

 

 

for stuck relay contact

 

 

 

(relay problem)

 

Washer will only agitate

Reversing Relay

Check for 24V to coi I on

Replace reversing

 

 

spin. Check coil conti-

rel ay.

 

 

nuity.

 

Washer will only spin

Reversing Relay

Check for constant 24V

Replace relay or control

 

 

to relay coil (control

board.

 

 

problem). Check for

 

 

 

relay problem.

 

Washer will not spin or

No power to washer

Check 120 VAC input

Plug in washer. Reset

agitate

 

to the washer

breaker or replace

 

Lid Open

'I E' will persist in

fuse.

 

 

washer display if lid

Shut I id

 

 

isn't shut

Replace lid switch

 

Lid Switch

Check for continuity

Replace wiring

 

 

across lid switch with

 

 

 

the lid shut

 

 

 

Check for continuity

Replace motor

 

Motor

from control board

Replace control board

 

 

output to motor run

 

 

 

relay and from relay

Replace motor run

 

Control Board

 

relay

 

 

contacts to the motor

 

 

 

Perform motor check

 

 

Motor Run Relay

 

 

 

 

Put washer into spin

 

 

 

and check for relay

 

 

 

contact closure

 

   

SYMPTOM

CAUSES

TEST PROCEDURE

SOLUTION

Washer spins instead of

Reversing (Spin) Relay

With power off check

Replace reversing relay

agitates

Control Board

relay for welded con-

Replace control board

 

 

tacts

 

Washer agitates in spin

Washer agitates in

Check for 24V across

Replace wiring, relay

cycle

spin cycle

relay coil - (control

coil, or control board

 

 

board problem)

Replace relay

 

Reversing (Spin)

Put washer into spin

Replace control board

 

Relay

and check for contact

 

 

 

closure

Replace wiring

 

 

Check for continuity

 

 

Control Board

from spin relay to

 

 

 

control board output

 

 

 

and from spin relay

 

 

Wire harness

contacts to the motor

 

 

 

terminals.

 

Washer will not fill.

No water to machine.

Check faucets

Turn of faucets

 

Overflow Switch

Check for continuity

Replace pressure

 

Water Valve

across switch 4 to 5

switch if open

 

Water Level Switch

Check for continuity

Replace valve

 

Wire Harness

across valve

Replace pressure

 

 

solenoids. This is 24V

switch if necessary

 

Control Board

valve, do not use

 

 

 

motor test cord to

Replace wiring

 

 

check!

Replace board

 

 

Check continuity of

 

 

 

pressure switch. (See

 

 

 

schematic)

 

 

 

Check for continuity

 

 

 

from board output to

 

 

 

valve coil

 

Washer fills until the

Water Level Switch

Check continuity of

Replace pressure

overflow switch disen-

Wire harness

pressure switch (See

switch

gages, level too high

 

schematic)

Replace wiring

 

Control Board

 

 

 

 

Check for continuity

Replace control board

 

 

from the water level

 

 

 

switch outputs to their

 

 

 

board inputs

 

Washer overflows

Water Valve

Turn control off. If the

Replace valve

 

 

washer continues to fill,

 

 

 

replace valve. See

 

 

 

above.

 

Water levels are not

Water level sensors

Check continuity of

Replace pressure

right, washer agitates

Control board

pressure switch

switch

 

Wire harness

Check for continuity

Replace control board

 

 

from the water level

Switch or replace

 

Wires switched

switch outputs to their

 

 

 

board inputs.

wiring

 

ELECTRICAL  MECHANICAL

TROUBLESHOOTING

Will Not Run

Dryer won't start or run.

All wires are hooked up to their corresponding terminals.

Dryer is plugged in.

Blown fuse or circuit breaker.

Door switch.

Push‑to‑start switch.

 Timer.

* Drive motor.

Thermal fuse.

Drive motor runs  drum won't turn.

Belt off or broken.

Motor pulley loose or off.

Idler tension spring.

Idler pulley.

Dryer runs a few minutes and then stops Motor overload protector opens.

Lint build up around drive motor.

Low voltage.

Blower impeller blocked.

Drive motor

Dryer blows fuses or trips circuit breaker.

Electric Models

The amperage readings are at 240 volts. One line will be 24 amps and the other line will be 21 amps. The neutral line will be at 4 amps. If you have the above amperage readings, the problem is not the dryer. Check the fuse box, circuit breaker or house wiring.

Shorted heating element.

Incorrect wiring or a wire shorting to ground.

Drive motor.

Gas Models

During ignition the dryer will draw 7 amps. With the burner on, the dryer will draw 4.5 amps. If the dryer is drawing the above amperage and the fuse blows, the problem is not the dryer. Check the fuse box, circuit breaker or house wiring.

Igniter.

Incorrect wiring or a wire shorting to ground

Drive motor.

Always disconnect power supply before making any continuity checks or resistance readings.

 

Will Not Dry
Dryer won't heat (motor runs).

ELECTRIC MODELS

Blown fuse or tripped circuit breaker.
Open heating element.
Hi-limit thermostat.
Regulating thermostat. Temperature selector switch.
Timer.
Cycle selector switch (where used).
Drive motor start switch.

Improper Drying -- Clothes Wrinkled --

Harsh -- Taking too long Lint filter is clean. Restriction in exhaust. Exhaust hood door stuck. Exhaust too long. Poor make-up air. Incorrect drum speed. Adjust motor pulley or wrong motor pulley.

Blower impeller bound.
Be sure element or gas valve cycles on and off.
Shorted heating element - electric dryers only.
Customer overloading dryer. Check clothing labels for fabric content.

MISCELLANEOUS

Dryer noisy.

Thumping sound. Check for loose drum baffle.
Thumping sound. Rear drum roller(s) worn or misaligned.
Thumping sound. Check drum for rough spots.
Ticking sound. Loose wire hitting cabinet or other component.
Ticking sound. Check for a n object caught in the blower.

Scraping sound, Front or rear bulkhead felt seal out of position.

Scraping sound. Teflon bearings mounted to the front bulkhead worn.
Popping or squealing sound. Check for a sticky belt or frayed belt.

Buzzer will not buzz at end of cycle. 
Be sure all wires are connected and wired correctly on the timer, buzzer and drive motor.
Buzzer.
Motor centrifugal switch sticking in run position.

Buzzer stays on too long or goes off too quickly. 

Length of time the buzzer stays on is dependent upon the time it takes the motor to slow down, allowing the motor switch to reset. The normal time increment is between 2 and 3 seconds.

Buzzer will not periodically buzz during permanent press cool down.

* Timer.

FAULT CODE

The microprocessor board has the capability to detect certain problems associated with the operation of the dryer. When the microprocessor board detects one of these problems it displays a fault code in the dryer's display window. The fault code is displayed as a letter E followed by a number that corresponds to the problem.

FAULT CODES

* 9E corresponds to a malfunction in the
dryer door circuit on the control board.

8E Corresponds to a malfunction in the motor relay circuit.

7E corresponds to a temperature control error in which either the thermistor circuit is in error or the 150 degree thermostat circuit has failed and the dryer has reached an abnormal temperature.

6E corresponds to another temperature control error in which either the thermistor circuit is in error or the temperature surrounding the dryer is too low for proper operation.

 

Always disconnect power supply before making any continuity checks or resistance readings.

WASHER -- ELECTRICAL TROUBLESHOOTING

Will Not Fill:

1. Is power available to unit?
No, check fuse or circuit breaker.

2. Disconnect power supply.

CAUTION

Always disconnect power supply before making continuity or resistance checks.

Note: When checking continuity or resistance, remove wires to isolate circuit.

3.Check continuity across Line Switch (place Timer in "FILL" position and switch in the "PULL" position).

A. Disconnect wires BU (Electric) or Y-BK (Gas) and R-13K from Timer.
B. Attach ohmmeter leads to these terminals.
C. Make check. No continuity, replace Timer.
4. Check continuity across Lock Switch (unlocked position).

A. Disconnect wires R-13K and W-OR from switch.

B. Attach ohmmeter leads to these terminals

C. Make check. No continuity, replace Lid Switch.

40 5. Check for continuity across Timer Cams 2 and 3.

A. Remove wires ORANGE to YELLOW, or ORANGE to PURPLE

B. Attach ohmmeter leads to these terminals. Make check (this will check for continuity across both cams).

C. No continuity, replace Timer.

6. Make continuity check across Temp Switch (temperature selection will determine which contacts to check).

A. For C-C and W-C remove wires YELLOW and BLUE.

B. For H-C and W-C remove wires PURPLE to ORANGE.

C. Attach ohmmeter leads to respective terminals.

D. No continuity on either check, replace valve.

Make continuity check across Water Valve.

A. Remove wires from Cold side of solenoid, BLUE and WHITE.

B. Remove wires from Hot solenoid, ORANGE and WHITE.

C. Attach ohmmeter leads to respective terminals.

D. No continuity on either check, replace valve.

8. Check continuity across Level Selector. Remove wires for selected level.

A. Small - PINK and GREY.

B. Medium - BROWN and GREY.

C. Large - YELLOW and GREY.

D. Attach ohmmeter leads to respective terminals. Make check.

E. No continuity, replace switch.

Check continuity across Pressure Switch. Remove wires for selected level.

A. Small - PINK and WHITE.

B. Medium - BROWN and WHITE.

C. Large - YELLOW and WHITE.

D. Attach ohmmeter leads to respective terminals. Make check.

E. No continuity, replace switch.

10. If other checks are determined to be good, check continuity of wire connections across Connector (between washer controls and washer unit).

Will Not Agitate:

1. Place Timer in agitate position.

2. Did Washer fill with water? If not, refer to "Will Not Fill

3. Is Lid closed?

4. Disconnect power supply.

CAUTION

Always disconnect power supply before making continuity or resistance checks.

Note: When checking continuity or resistance, remove wires to isolate circuit.

5. Check continuity across Pressure Switch. Remove wires for selected level.

A. Small - ORANGE and PURPLE.

B. Medium - BROWN and PURPLE.

C. Large - YELLOW and PURPLE.

D. Attach ohmmeter leads to respective terminals.

E. No continuity, replace switch.

6. Check continuity across Lid Switch (lid closed).

A. Remove wires RED and ORANGE from switch.

B. Attach ohmmeter leads to these terminals. Make check.

C. No continuity, replace switch.

7. Check continuity across Unbalance Switch (lid switch closed).

A. Remove wires BROWN and ORANGE.

B. Attach ohmmeter leads to these terminals. Make check.

C. No continuity, replace switch.

8. Check continuity across Run Relay.

A. Disconnect all wires from Run Relay.

B. Attach ohmmeter leads to terminals YELLOW and GREY.

C. No continuity, replace relay.

D. With coil energized, make check across terminals BLK and BLK. No continuity, replace relay.

C. Make check. No continuity, replace Lid Switch.

5. Check for continuity across Timer Cams 2 and 3.

A. Remove wires ORANGE to YELLOW, or ORANGE to PURPLE

B. Attach ohmmeter leads to these terminals. Make check (this will check for continuity across both cams).

C. No continuity, replace Timer.

6. Make continuity check across Temp Switch (temperature selection will determine which contacts to check).

A. For C-C and W-C remove wires YELLOW and BLUE.

B. For H-C and W-C remove wires PURPLE to ORANGE.

C. Attach ohmmeter leads to respective terminals.

D. No continuity on either check, replace valve.

7. Make continuity check across Water Valve.

A. Remove wires from Cold side of solenoid, BLUE and WHITE.

B. Remove wires from Hot solenoid, ORANGE and WHITE.

C. Attach ohmmeter leads to respective terminals.

D. No continuity on either check, replace valve.

8. Check continuity across Level Selector. Remove wires for selected level.

A. Small - PINK and GREY.

B. Medium - BROWN and GREY.

C. Large - YELLOW and GREY.

D. Attach ohmmeter leads to respective terminals. Make check.

E. No continuity, replace switch.

9. Check continuity across Pressure Switch. Remove wires for selected level.

A. Small - PINK and WHITE.

B. Medium - BROWN and WHITE.

C. Large - YELLOW and WHITE.

D. Attach ohmmeter leads to respective terminals. Make check.

E. No continuity, replace switch.

10. If other checks are determined to be good, check continuity of wire connections across Connector (between washer controls and washer unit).

Will Not Agitate:

1. Place Timer in agitate position.

2. Did Washer fill with water? If not, refer to "Will Not IF

3. Is Lid closed?

4. Disconnect power supply.

CAUTION

Always disconnect power supply before making continuity or resistance checks.

Note: When checking continuity or resistance, remove wires to isolate circuit.

Check continuity across Pressure Switch. Remove wires for selected level.

A. Small -ORANGE and PURPLE.

B. Medium - BROWN and PURPLE.

C. Large - YELLOW and PURPLE.

D. Attach ohmmeter leads to respective terminals.

E. No continuity, replace switch.

6. Check continuity across Lid Switch (lid closed).

A. Remove wires RED and ORANGE from switch.

B. Attach ohmmeter leads to these terminals. Make check.

C. No continuity, replace switch.

7. Check continuity across Unbalance Switch (lid switch closed).

A. Remove wires BROWN and ORANGE.

B. Attach ohmmeter leads to these terminals. Make check.

C. No continuity, replace switch.

8. Check continuity across Run Relay.

A. Disconnect all wires from Run Relay.

B. Attach ohmmeter leads to terminals YELLOW and GREY.

C. No continuity, replace relay.

D. With coil energized, make check across terminals BILK and BILK. No continuity, replace relay.

9. Make continuity checks across Timer Cams 5, 6 and 7.

A. Cam 5, remove wires RED to GREY.

B. Cam 6, remove wires RED/BLUE to GREY.

C. Cam 7, remove wires 22 to GREY.

D. Attach ohmmeter leads to the respective terminals and make checks.

E. No continuity on any of these checks, replace Timer.

10. Check Drive Motor.

Remove wires from Drive Motor and attach motor test cord. If Drive Motor fails to start, replace motor.

11. Check wire connections between Washer Controls and Washer Unit at Connector.

Will Not Spin:

1. Disconnect power supply.

CAUTION

Always disconnect power supply before making continuity or resistance checks.

Note: When checking continuity or resistance, remove wires to isolate circuit.

2. Place Timer in spin position.

3. Check continuity across Timer Cams 1, 5, 6 and 7.

A. Cam 1, remove wires PURPLE and GREY.

B. Cam 5, remove wires RED and GREY.

C. Cam 6, remove wires RED/BLUE and WHITE.

D. Cam 7, remove wires YELLOW and RED.

E. Attach ohmmeter leads to respective terminals. Make checks.

F. No continuity on any of these checks, replace Timer.

4. Check continuity across Lid Switch.

A. Remove wires RED and ORANGE from switch.

B. Attach ohmmeter leads to these terminals.

C. Make check with lid closed or button depressed.

D. No continuity, replace switch.

5. Check continuity across Unbalance Switch (lid switch closed).

A. Remove wires BROWN and ORANGE.

B. Attach ohmmeter leads to these terminals. Make check.

C. No continuity, replace switch.

6. Check continuity across Run Relay.

A. Disconnect all wires from Run Relay.

B. Attach ohmmeter leads to terminals YELLOW and GREY.

C. No continuity, replace relay.

D. With coil energized, make check across terminals BLK and BLK. No continuity, replace relay.

7. Check for continuity across Line Switch (place switch in the "Pull" position).

A. Remove wires RED (Gas or Electric) and RED from Timer.

B. Attach ohmmeter leads to these terminals.

C. Make check. No continuity, replace Timer.

8. Reversing Relay (See Sec. 3, Service Procedures).

9. Test Drive Motor using motor test cord. If Drive Motor does not start, replace Drive Motor.

10. Check wire connections between Washer Controls and Washer Unit at Connector.

DRYER -- ELECTRICAL TROUBLESHOOTING

Will Not Start:

1. Disconnect power supply.

- CAUTION

Always disconnect power supply before making continuity or resistance checks.

Note: When check continuity or resistance, remove wires to isolate circuit.

Check continuity across Door Switch. A. Remove wires BU and YL (Gas) or WH and YL (Electric).

B. Attach ohmmeter leads to respective terminals. C. Check for continuity with switch in "closed" position. No continuity, replace switch.

3. Check continuity across Push To Start Switch (manually close switch)

A. Remove wires YELLOW and RED from switch.

B. Attach ohmmeter leads to these terminals. Make check.

C. No continuity with switch in "closed" position, replace switch.

4. Check Timer Cam number 1. Place Timer in a cycle.

A. Remove wires Y-BK and GY from Timer.

B. Attach ohmmeter leads to these terminals. Make check.

C. No continuity, replace Timer.

5. Check Thermal Fuse for continuity.

A. Remove GY and GY wires from fuse.

B. Attach ohmmeter to these terminals. Make check.

C.No continuity, replace fuse.

6. Test Drive Motor using motor test cord. If Drive Motor does not start, replace Drive Motor.

Will Not Heat:

1. Disconnect power supply.

CAUTION

Always disconnect power supply before making continuity or resistance checks.

Note: When check continuity or resistance, remove wires to isolate circuit.

Check continuity across Timer Cams number 3 and 4. Place Timer in heat cycle.

A. Remove wires BK and BILI from Timer.

B. Attach ohmmeter leads to these terminals.

C. Make check. This check will show if there is continuity between Cam 3 and Cam 4.

D. No continuity, replace Timer.

3. Check for continuity across Cycling Thermostat.

A. Remove wires BLI and PLI from thermostat.

B. Attach ohmmeter leads to these terminals. Make check.

C. No continuity at room temperature, replace thermostat.

4. Check for continuity across Hi-Limit Thermostat.

A. Remove PU and RD wires (Gas) or PU and BR (Electric) from thermostat.

B. Attach ohmmeter leads to respective terminals. Make check.

C. No continuity at room temperature, replace thermostat.

5. Check continuity across contacts BU and BK in Centrifugal Switch,

A. Remove wires BU and BK from switch.

B. Attach ohmmeter leads to these terminals. Manually close switch.
C. No continuity, replace motor start switch.

6. Check Heater for continuity (Electric).

A. Remove BR and BK wires from Heater.

B. Attach ohmmeter to these terminals. Make check.

C. No continuity, replace heating element.

7. Check Gas Valve. (See Service Procedures - Section 4).

DIRECT IGNITION SYSTEM

- CAUTION

Always disconnect power supply before making continuity or resistance checks.

When the dryer is operated on a heat setting, the ignitor should be energized and the burner shall fire within 45 seconds at 120 volts. Check for the existence of the flame. De-energize the gas control and re-energize. The flame should reappear within one minute.

The failure of a component in this system will usually be indicated by one of three symptoms:

1. The ignitor does not glow.

2. The ignitor glows but no gas ignition takes place.

3. The gas is ignited but the flame goes out.

1. No Ignitor Glow

If the ignitor does not heat up, remove power and using an ohmmeter, check the following:
Open Flame Sensor
Open Ignitor
Shorted Booster Coil
Open Wiring

2. Ignitor Glows - No Gas Ignition

If the ignitor heats up but the main burner flame is not ignited, remove power and using an ohmmeter, check the following:
Open Secondary Coil
Open Holding Coil
Open Wire

Other causes that will not show up in a continuity check but should be examined:
Check Gas Valve
Restriction in the Burner Orifice
Ignitor Improperly Installed

Gas Ignites - Flame Goes Out

If a normal ignition takes place and after a short while the flame goes out, check for the following:
  Erratic Radiant Sensor
  Coils on Gas Valve

CAUTION

Reconnect electrical wires and check all gas connections for leaks before reconnecting to power supply.

 

 SERVICE PROCEDURES

ALWAYS DISCONNECT FROM POWER SOURCE BEFORE SERVICING

CONTROLS


The controls for the washer section are located in three places. The microprocessor board and touch pad are part of the control center which is located at the bottom of the dryer's front panel. The transformer is located behind the lower access panel on the dryer- The control components responsible for the operation of the washer are located inside the washer cabinet.

 

 

To Remove The Control Panel Cover

Remove the two screws securing control panel cover to dryer front panel. Note control panel has three tabs at the top.

Microprocessor Board

The microprocessor board is an electronic circuit board which is located behind the touch pad on the control panel. It controls the various cycles and functions on both the washer and dryer.

The touch pad provides a means to input cycle and function selections to the microprocessor board. The touch pad is connected to the microprocessor board through a connecting strip.

To Remove:
1. Disconnect dryer power cord.
2. Remove control panel cover.
3. Remove three screws securing touch pad assembly and microprocessor board to dryer front panel.
4. Tip complete assembly forward and disconnect Piezo electric speaker and the 4, 9 and 10 or 11 pin edgeboard connectors.
5. Remove six nuts securing microprocessor board to touch pad assembly.
6. Remove the touch pad connecting strip from the connector on the microprocessor board. Apply a film of lubricate grease to inside of connector terminals when re-installing edgeboard

 

 

Self-Diagnostics

The microprocessor board also has the ability of self-diagnostics without the use of the circuit test board. It can automatically scan all functions of operation and if a problem exists, terminate operation while giving one of the following on the digital display.

Washer Display
'L' - Unbalance condition
'P" - Pause/Resu me mode selected
"--' - Soak mode
'-' - Spin mode
'1 E' - Lid switch problem


Touch Pad

The touch pad can be check for proper closures by using the following tables. The conductive strips read from top to bottom as follows and are represented by the 11 white" lines on the drawing. There are eleven (11) conductive strips on the touch pad ribbon connection. Ohmmeter reading is taken between two of the conductive strips with corresponding pad pressed (refer to chart in Section 2 - CONTROLS). Press each selection as indicated in tables and check for less than 200 ohms resistance. Without the pad pressed, reading between strips should be infinite.

The following listing shows the contacts made for the washer control panel touch pad.





Piezo Electric Speaker

Operation of the Piezo-Electric speaker is controlled by D2 (Pin 26) of the microcomputer. Transistor and associated circuitry using a feed-back signal from the speaker (blue wire) provides a resonant frequency of 3K Hz.





To Remove:

1. Disconnect unit from power source.

2. Remove control panel cover.

3. Remove two screws securing speaker
to dryer front panel.
4. Disconnect wire connector from
speaker to microprocessor board.

To Check.

Replace the speaker with a new speaker. If new speaker responds, original speaker was inoperative.

 

Transformer

The transformer steps 120 volts AC primary voltage down to two secondary voltages that go to the microprocessor board.
The 26.4 volt AC output provides operating power for the motor and heater relays in the dryer section and for the motor run
relay, motor reversing relay, water valve solenoids and lid lock solenoid in the washer section. A full-wave bridge rectifier on the microprocessor board converts the 26.4 volts AC to 24 volts DC to operate the DC components in both sections.

The 10 volt AC output provides operating power for the microprocessor circuits, the displays and individual light emitting diodes for the various option selections. Timing reference signals are derived from this secondary. This output is also changed to DC by a bridge rectifier circuit on the microprocessor board and is further filtered and regulated for the microprocessor controlled power.

A fast acting MOV (metal oxide varistor) is connected across the primary input terminals to suppress line voltage surges which could damage the microprocessor. If the MOV appears damaged, replace the transformer.

The transformer is located behind the lower access door on the dryer and is secured to the dryer base.

To Remove Transformer
1. Disconnect dryer power cord from power supply.
2. Remove the two screws that secure the
access panel to the dryer.
3. Disconnect wires from the transformer.
4. Remove the two that secure the trans-
former to the dryer base.

To Check Continuity:

CAUTION
Always disconnect dryer power cord from power supply before making continuity checks or taking resistance readings.

Primary Side
Make continuity check across terminals WH to YL/BK. If checking resistance, should see about 19 ohms. No continuity, replace transformer.

Secondary Side
1. Make continuity check across terminals RD/BK to RD/BK. If checking, should see about I ohm. No continuity, replace transformer.

2. Make continuity check across terminals BILI to BU. If checking resistance, should see about 1.2 ohms. No continuity, replace transformer.

To Check Voltage:
- CAUTION

Always use extreme care when making live voltage checks.


Primary Side
With wires attached to the transformer and dryer connected to the power supply

perform following checks.

Attach volt meter leads across terminals WH and YL/BK. Meter should read 120 VAC.

Secondary Side
1. Attach volt meter leads across terminals RD/BK and RD/BK. Meter should read 10 VAC.

2. Attach volt meter leads across terminals BL and BL. Meter should read 26 VAC.

Voltage readings suspect, check power supply or replace transformer.

Varistor (Mov-Metal Oxide Varistor)

The varistor is designed to protect the microprocessor board from excessive voltage. At normal line voltage, the varistor shows extremely high resistance. When the line voltage exceeds the threshold of the varistor, its resistance decreases to a point of providing a voltage bleed-off path. This will prevent line voltage surges or "spikes" from reaching the microprocessor board.

The varistor is actually part of the transformer. If visual inspection shows a damaged varistor, the transformer should be replaced.

 

 

 

 

 

 

maytagspannerwrench.jpg (41646 bytes) 
Click on image for a larger view

This wrench is used to remove the nut #50 
which holds in the inner tub
& The mounting stem #31 

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